Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION Stock-Based Compensation (Details)

v3.4.0.3
STOCK-BASED COMPENSATION Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total stock-based compensation expense $ 8,923 $ 9,497
Total unrecognized compensation cost $ 53,300  
Amortization period of unrecognized compensation cost (in years) 2 years 11 days  
Stock Option [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Percent of current year grants by type of award 65.00%  
Weighted-average fair value per option granted $ 6.95  
Restricted Stock [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Percent of current year grants by type of award 35.00%  
Weighted-average fair value per restricted stock award granted $ 19.36  
Selling, general and administrative expenses [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total stock-based compensation expense $ 4,414 4,742
Corporate expenses [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total stock-based compensation expense $ 4,509 $ 4,755